The outlet the dryer is plugged into needs to provide the proper amount of power to the dryer. Check the fuse controlling the outlets in the room where the dryer is located. Make sure it is flipped to the "On" position. Plug a different appliance into the outlet to determine whether the outlet is getting power. Insert the probes from a voltmeter into the outlet holes if the appliance doesn't work. Set the voltmeter to the voltage setting. You should get at least 120 volts for your dryer to work.
If you hear the motor running, the belt of the dryer might have broken or been stretched. A belt runs around the motor, over the idler pulley and finally around the dryer tumbler. The belt turns the tub when the motor begins to run. Push the dryer away from the wall behind it to access the belt. Tug on the belt to see if it is taut. If not, you will need to route a new belt around the idler pulley and the drum.
The idler pulley sits directly above the motor. The belt of the machine routes around the pulley. A faulty idler pulley may cause the belt to stick or slip. Remove the front plate from the machine and locate the pulley. Turn the wheel of the pulley. It should move freely. If not, the idler pulley needs to be greased or replaced.
The motor of the dryer needs to work properly to turn the belt. If you hear a loud whining noise from the motor when you turn on the dryer or smell a burning motor odor, or the motor fails to make any noise at all, the motor is likely faulty. Purchasing a new dryer is often less expensive than replacing the motor, unless you can find salvage parts from an old machine.